CN110470596B - In-situ test device and method for simulating cement stone cementing strength under high-temperature high-pressure underground working condition - Google Patents
In-situ test device and method for simulating cement stone cementing strength under high-temperature high-pressure underground working condition Download PDFInfo
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- CN110470596B CN110470596B CN201910865675.5A CN201910865675A CN110470596B CN 110470596 B CN110470596 B CN 110470596B CN 201910865675 A CN201910865675 A CN 201910865675A CN 110470596 B CN110470596 B CN 110470596B
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- 239000004568 cement Substances 0.000 title claims abstract description 87
- 238000012360 testing method Methods 0.000 title claims abstract description 34
- 239000004575 stone Substances 0.000 title claims abstract description 21
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 129
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000012856 packing Methods 0.000 claims description 49
- 210000004907 gland Anatomy 0.000 claims description 21
- 238000003860 storage Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 6
- 239000008398 formation water Substances 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 239000000314 lubricant Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 235000014121 butter Nutrition 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 229910000856 hastalloy Inorganic materials 0.000 claims 1
- -1 polytetrafluoroethylene Polymers 0.000 claims 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims 1
- 239000004810 polytetrafluoroethylene Substances 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
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Abstract
The invention provides an in-situ test device and method for simulating cement paste cementing strength under high-temperature high-pressure underground working conditions, wherein the device mainly comprises: sealing kettle cover, sealing kettle body, top column, movable base, sleeve, sealing cover plate, heating and heat-preserving device, sensor, acquisition control system, etc. According to the invention, the underground working condition is simulated by using the sealing kettle, a cement curing cavity is formed by the sealing cover plate, the movable base and the sleeve, cement is cured in the curing cavity, after curing, cement stone cementing strength test work is carried out, data is obtained from a force-displacement curve displayed by the acquisition control system, and the cementing strength of cement stone under the conditions of high temperature and high pressure is calculated based on the data. The invention can test the cementing performance of the cement stone under the simulated underground working condition in the original state, and provides technical support for optimizing the well cementation cement paste and improving the well cementation quality.
Description
Technical Field
The invention relates to the technical field of well cementation in the petroleum and natural gas development process, in particular to a device and a method for testing the cementing strength of well cementation cement stones.
Background
One of the purposes of cementing an oil and gas well is to effectively seal an annular space outside a sleeve, and prevent formation fluid from flowing in the drilling, yield increasing operation and production process of the oil and gas well. In the well cementation process, cement paste is an important material for sealing the annular space between the sleeve and the well wall, cement paste is finally solidified under the high-temperature and high-pressure environment in the well to form cement paste with certain cementing capacity between the well wall and the sleeve, and the cementing strength directly influences the space packing degree, so that how to test the cementing strength of the cement paste and make the cement paste reach the requirement is the important point to be considered in well cementation.
In the devices for testing cement paste bond strength in the laboratory disclosed at present, most of the devices require experimenters to pour cement paste into annular spaces of a simulation sleeve and a simulation oil pipe, and put the whole curing device under specified conditions for curing for a period of time, after curing is finished, the curing device is disassembled, a press is used for pressure testing, and the pressure of the inner ring interface and the outer ring interface when the cement paste is peeled off is respectively recorded, so that bond strength is obtained, such as a cementing cement bond strength testing device (CN 105422080A). However, there is a limitation in the process of this operation, such as the risk of the cement stone structure or strength being changed if the cured set cement is placed under indoor conditions, thereby causing a certain error in the cement strength test result.
Aiming at the situation, the invention provides the in-situ test device and the in-situ test method for simulating the cementing strength of the cement stones under the high-temperature high-pressure underground working condition, thereby providing technical support for selecting high-quality cement paste in the well cementation operation and improving the well cementation quality.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a novel device and a method for simulating the in-situ test of the cementing strength of cement stones under the working conditions of high-temperature and high-pressure wells, which are convenient for selecting high-quality cement paste in the well cementation operation of the high-temperature and high-pressure wells.
The invention is realized by the following technical scheme: an in-situ test device for simulating cement paste cementation strength under high-temperature high-pressure underground working conditions, comprising: sealing kettle, cement paste curing means and cementing strength testing means.
The invention provides a sealing kettle for simulating an in-situ test device for cement bond strength under high-temperature high-pressure underground working conditions, which mainly comprises: the sealing kettle comprises a sealing kettle cover, a sealing kettle body, a fixing bolt gasket, a rubber sealing gasket, a jacking column, an upper nut, an upper gasket, an upper gland, an upper packing box, a movable base, a lower nut, a lower gasket, a lower gland, a lower packing box, an air inlet, an air outlet, an upper groove and a lower groove. The sealing kettle cover is fixed on the sealing kettle body through the fixing bolts, the fixing bolts apply pressure to tightly press the rubber sealing gasket between the sealing kettle cover and the sealing kettle body, and the sealing performance of the experimental device can be further improved due to the gasket. The sealing kettle cover center has the upper groove, after screwing the upper nut, the upper nut can press the upper gasket, the upper gasket extrudes the upper gland, then extrudes the upper packing, the upper packing is made to hold the jack-prop tightly, the jack-prop is fixed in an auxiliary way through the upper nut, the upper gasket, the upper gland and the upper packing, the upper packing has the function of fixing the jack-prop, the sealing kettle cover center also can seal the device to a certain extent, the sealing kettle body bottom center has the lower groove, the movable base is fixed in an auxiliary way through the lower nut, the lower gasket, the lower gland and the lower packing, the lower packing box is arranged at the bottom of the sealing kettle body, the lower packing is extruded by the lower gland, the movable base is held tightly by the lower packing, and accordingly the sealing of the sealing kettle body bottom is realized. The bottom of the sealing kettle body is provided with an air inlet, and the sealing kettle cover is provided with an air outlet.
The invention provides a cement slurry maintenance device for simulating an in-situ test device for cement bond strength under high-temperature high-pressure underground working conditions, which mainly comprises: the sealing device comprises an outer barrel, a sleeve, a sealing cover plate, a movable base, an upper rubber sealing piece and a lower rubber sealing piece. The urceolus is placed in sealed cauldron body bottom, and the sleeve pipe is fixed in the urceolus, and movable base is fixed in the lower groovein sealed cauldron body bottom center, and movable base and sleeve pipe inner wall are mutually overlapped, and upper rubber seal inlays on the sleeve pipe inner wall, and movable base cover has lower floor rubber seal, and sleeve pipe, sealed apron and movable base form cement maintenance chamber for deposit the grout.
The invention provides a cementing strength testing device for simulating an in-situ testing device for the cementing strength of cement stones under high-temperature high-pressure underground working conditions, which mainly comprises: the device comprises a sleeve, a sealing cover plate, a top column, an upper nut, an upper gasket, a movable base, a lower nut, a lower gasket, an upper rubber sealing piece, a lower rubber sealing piece, a heating and heat preserving device, a temperature sensor, a pressure sensor and an acquisition control system. After the cement maintenance is finished, the lower nut is screwed to enable the movable base to move downwards, then the upper nut is screwed, an external device is used for applying force to the jacking column to enable the jacking column to move downwards, the sealing cover plate is pressed, the sealing cover plate is then pressed against the cement stone, the solidified cement stone in the sleeve and the inner wall of the sleeve slide relatively, the force applied by the jacking column is collected by the pressure sensor, mechanical data are transmitted to the collection control system by the pressure sensor, and the cementing strength of the cement stone is calculated based on the data.
It should be noted that the in-situ testing device for simulating the cementing strength of the cement under the high-temperature high-pressure underground working condition disclosed by the invention has the advantages that before assembly and fixation, grease needs to be smeared on the contact surfaces among main components, including the contact surfaces among the sealing cover plate, the upper rubber sealing piece and the inner wall of the sleeve, the contact surfaces among the movable base, the lower rubber sealing piece and the inner wall of the sleeve, and the contact surfaces among the sealing kettle cover, the rubber sealing gasket and the sealing kettle body, on one hand, the sealing performance among all the contact surfaces can be improved, and on the other hand, the adhesion between the movable base and the inner wall of the sleeve in the cement slurry coagulation process can be prevented, so that the movable base can move downwards during the cementing strength testing work conveniently.
The beneficial effects of the invention are as follows:
(1) The cement paste bonding strength can be tested in situ under the simulated underground working condition, and the risk of changing the structure or strength of the cement paste when the cement paste is transferred from the curing environment to the indoor environment is eliminated.
(2) The high-temperature and high-pressure environment can be formed through the sealing kettle and the heating and heat preserving device, the cementing performance of the cement paste under the preset temperature and pressure conditions is tested, and technical support is provided for optimizing the well cementing slurry and improving the well cementing quality.
Drawings
FIG. 1 is a schematic diagram of the device for setting and curing cement paste;
FIG. 2 is a schematic diagram of the apparatus of the present invention for testing the strength of a set cement;
FIG. 3 is a schematic view of the sealing kettle cover, the top column, the upper nut, the upper gasket, the upper gland and the upper packing connection;
FIG. 4 is a schematic view of the joint of the sealing kettle body, the movable base, the lower gland, the lower packing, the lower nut and the lower gasket;
FIG. 5 is a schematic illustration of the dimensions of the seal cover, sleeve, outer barrel, and removable base;
FIG. 6 is a schematic diagram of a graph displayed by the acquisition control system during a cement strength test.
Detailed Description
The following describes in detail the main implementation principle of the technical scheme of the present invention, specific embodiments and the corresponding beneficial effects thereof with reference to examples:
example 1
The example discloses an in-situ test method for simulating cement paste cementing strength under high-temperature high-pressure underground working conditions, which comprises the following steps:
the method comprises the steps of firstly, smearing HM hydraulic oil on the contact surface of an upper packing (14) and a jack post (9) and the contact surface of a lower packing (21) and a movable base (16), storing a certain dose of HM hydraulic oil in an upper storage cavity (13) and a lower storage cavity (20), placing the lower packing (21) in a lower packing box (22) at the bottom of a sealing kettle body (2), placing a lower gland (19) above the lower packing (21), then sleeving the movable base (16) on the bottom of the sealing kettle body (2), and carrying out auxiliary fixing on the movable base (16) through a lower nut (17), a lower gasket (18), a lower gland (19) and the lower packing (21), so that the center lines of the movable base (16), the lower nut (17), the lower gland (19) and the sealing kettle body (2) are kept coincident, and the distance between the movable base (16) and the bottom of the sealing kettle body (2) is kept to be 9mm, so that the movable base (16) moves downwards when cementing strength test work is carried out;
step two, a sleeve (7) with the inner diameter D of 5cm is selected, an upper rubber sealing piece (23) is embedded on the inner wall of the sleeve (7), the sleeve (7) is sleeved with a movable base (16) and is placed at the bottom of a sealed kettle body (2), an outer cylinder (6) is sleeved outside the sleeve (7) to achieve the effect of fixing the sleeve (7), the central lines of the outer cylinder (6) and the sleeve (7) are overlapped with the central line of the movable base (16), and the distance from the upper rubber sealing piece (23) to the upper surface of the movable base (16) is measured and obtained to be 6cm, so that the cement sample height h is considered;
pouring the prepared cement paste A into the sleeve (7), continuously tamping the cement paste by using a stirring rod when pouring cement paste, carefully removing bubbles generated during stirring, compacting and homogenizing the cement paste, keeping the upper liquid level of the cement paste consistent with the height of an upper rubber sealing element (23) on the inner wall of the sleeve (7), and placing the sealing cover plate (8) in the sleeve (7), wherein the upper rubber sealing element (23) is embedded in the inner wall of the sleeve (7), so that the sealing cover plate (8) is just clamped at the height of the upper rubber sealing element (23), namely above the upper liquid level of the cement paste, thereby achieving the aim of sealing a cement curing cavity (31);
placing an upper packing (14) with lubricant in an upper storage cavity (13) in an upper packing box (15) of a sealing kettle cover (1), placing an upper packing (12) above the upper packing (14), sleeving a top column (9) to the center of the sealing kettle cover (1), sleeving an upper gasket (11) above the upper packing (12), overlapping the top column (9), an upper nut (10), the upper packing (12) and the central line of the sealing kettle cover (1), screwing the upper nut (10), pressing the upper gasket (11) against the upper packing (12), immediately pressing the upper packing (14), and tightly holding the top column (9) by the upper packing (14) in an extrusion state, so as to achieve the functions of fixing the top column (9) and sealing, and keeping the distance between the sealing cover (8) and the top column (9) to be 18mm when the sealing kettle cover (1) is connected with the sealing kettle body (2);
step five, adding simulated formation water, namely calculating the simulated formation water liquid level in advance, enabling the simulated formation water liquid level to be just higher than the height of a sealing cover plate (8), then placing a rubber sealing gasket (5) smeared with butter in a groove of a sealing kettle body (2), placing a sealing kettle cover (1) sleeved with a jacking column (9) above the sealing kettle body (2), fastening a fixing bolt (3) on the sealing kettle cover (1), fastening the sealing kettle cover (1) on the sealing kettle body (2), connecting a temperature sensor (28), the sealing kettle body (2), a heating and heat-preserving device (27) and a collecting and controlling system (30) through signal wires, enabling the collecting and controlling system (30) to operate and heat the heating and heat-preserving device (27), and keeping the cement paste curing condition that the pressure is 18MPa and the temperature is 80 ℃ and the curing time is 24 hours;
step six, after the cement maintenance is finished, screwing a lower nut (17) to enable a movable base (16) to move downwards, screwing an upper nut (10) subsequently, assisting an external device to apply force to a jack-up column (9), enabling the jack-up column (9) to move downwards at a constant speed, keeping the speed at 2mm/min, enabling a collection control system (30) to keep a data collection period of 5s, recording the force when the jack-up column (9) starts to move on a curve generated by the collection control system (30), and recording as the friction force F between the jack-up column (9) and a device part f 3264N;
step seven, in the acquisition F f After that, the jacking column (9) continues to move at a constant speed, so that the jacking column (9) presses against the sealing cover plate (8), the sealing cover plate (8) presses against the set cement until the set cement in the sleeve (7) slides relatively to the inner wall of the sleeve (7), and the maximum force F generated when the set cement slides relatively to the inner wall of the sleeve (7) is acquired from a curve generated by the acquisition control system (30) max 29169N;
and step eight, after the test work is finished, calculating to obtain the cementing strength M of the cement stone A and the sleeve (7) to be 2.75MPa by using the collected pressure data.
Example 2
The example discloses an in-situ test method for simulating cement paste cementing strength under high-temperature high-pressure underground working conditions, which comprises the following steps:
repeating the steps one to five of the example 1, wherein cement paste A is replaced by cement paste B, the inner diameter D of the sleeve (7) is 5cm, the distance from the upper rubber sealing piece (23) to the upper surface of the movable base (16) is measured and obtained to be 6.5cm, the distance between the movable base (16) and the bottom of the sealing kettle body (2) is regarded as a set cement sample height h, when the sealing kettle cover (1) is connected with the sealing kettle body (2), the distance between the sealing cover plate (8) and the jacking column (9) is kept to be 18mm, the cement paste curing condition is changed to be 20MPa, the temperature is 90 ℃, and the curing time is 24 hours;
step six, after the cement maintenance is finished, screwing the lower nut (17) to enable the movable base (16) to move downwards, and then screwing the upper screwA master (10) which is assisted by an external device to apply force to the jack-prop (9) so as to enable the jack-prop (9) to move downwards at a constant speed, the speed is kept at 2mm/min, the acquisition control system (30) is enabled to keep a data acquisition period of 5s, the force when the jack-prop (9) starts to move is recorded on a curve generated by the acquisition control system (30), and the force is recorded as the friction force F between the jack-prop (9) and a device part f 3929N;
step seven, in the acquisition F f After that, the jacking column (9) continues to move at a constant speed, so that the jacking column (9) presses against the sealing cover plate (8), the sealing cover plate (8) presses against the set cement until the set cement in the sleeve (7) slides relatively to the inner wall of the sleeve (7), and the maximum force F generated when the set cement slides relatively to the inner wall of the sleeve (7) is acquired from a curve generated by the acquisition control system (30) max 36993N;
and step eight, after the test work is finished, calculating to obtain the cementing strength M of the cement stone B and the sleeve (7) to be 3.24MPa by using the collected pressure data.
Finally, it should be noted that: the above examples are only for illustrating the technical solution of the present invention, and are not limiting thereof; although the invention has been described in detail with reference to the foregoing examples, those of ordinary skill in the art will understand that; the technical scheme recorded in the previous example can be modified or some or all technical features in the technical scheme can be replaced equivalently; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the scope of the example technical solutions of the present invention.
Claims (4)
1. The utility model provides a simulation high temperature high pressure is cement stone cementing strength normal position testing arrangement under operating mode in pit which characterized in that: the device consists of a sealing kettle, a cement slurry curing device and a cementing strength testing device;
the sealing kettle consists of a sealing kettle cover (1), a sealing kettle body (2), a fixing bolt (3), a fixing bolt gasket (4), a rubber sealing gasket (5), a jacking column (9), an upper nut (10), an upper gasket (11), an upper gland (12), an upper packing (14), an upper packing box (15), a movable base (16), a lower nut (17), a lower gasket (18), a lower gland (19), a lower packing (21), a lower packing box (22), an air inlet (25), an air outlet (26), an upper groove (32) and a lower groove (33), wherein the sealing kettle cover (1) is fixed on the sealing kettle body (2) through the fixing bolt (3), and the fixing bolt (3) applies pressure to tightly press the rubber sealing gasket (5) between the sealing kettle cover (1) and the sealing kettle body (2); an upper groove (32) is formed in the center of the sealing kettle cover (1), and the jacking column (9) is fixed in the upper groove (32) in an auxiliary manner by an upper nut (10), an upper gasket (11), an upper gland (12) and an upper packing (14); a lower groove (33) is formed in the center of the bottom of the sealing kettle body (2), and the movable base (16) is fixed in the lower groove (33) in an auxiliary manner by a lower nut (17), a lower gasket (18), a lower gland (19) and a lower packing (21); an air inlet (25) is formed in the bottom of the sealed kettle body (2), and an air outlet (26) is formed in the sealed kettle cover (1);
the cement slurry curing device consists of an outer cylinder (6), a sleeve (7), a sealing cover plate (8), a movable base (16), an upper rubber sealing piece (23) and a lower rubber sealing piece (24), wherein the sleeve (7) is fixed in the outer cylinder (6), the upper rubber sealing piece (23) is embedded on the inner wall of the sleeve (7), the lower rubber sealing piece (24) is sleeved on the movable base (16), and the sleeve (7), the sealing cover plate (8) and the movable base (16) form a cement curing cavity (31);
the cementing strength testing device consists of a sleeve (7), a sealing cover plate (8), a jacking column (9), an upper nut (10), an upper gasket (11), a movable base (16), a lower nut (17), a lower gasket (18), an upper rubber sealing piece (23), a lower rubber sealing piece (24), a heating and heat preserving device (27), a temperature sensor (28), a pressure sensor (29) and an acquisition control system (30), wherein the heating and heat preserving device (27) is enveloped on the outer wall of a sealing kettle body (2), and data generated by the temperature sensor (28) and the pressure sensor (29) are acquired and integrated by the acquisition control system (30);
the rubber sealing gasket (5), the upper packing (14), the lower packing (21), the upper rubber sealing piece (23) and the lower rubber sealing piece (24) are made of polytetrafluoroethylene materials, the fixing bolt gasket (4), the upper gasket (11) and the lower gasket (18) are made of hastelloy materials, the upper packing (14) and the lower packing (21) are trapezoidal packing, and an upper storage cavity (13) and a lower storage cavity (20) which are provided with lubricating agents are arranged in the packing;
the diameter D1 of the sealing cover plate (8) is 0.7mm-1mm smaller than the inner diameter D of the sleeve (7), the diameter D2 of the movable base (16) is 0.7mm-1mm smaller than the inner diameter D of the sleeve (7), and the outer diameter D3 of the sleeve (7) is 1mm-1.5mm smaller than the inner diameter D4 of the outer cylinder (6).
2. The in-situ testing device for simulating cement paste cementation strength under high-temperature high-pressure underground working conditions according to claim 1, wherein the in-situ testing device is characterized in that: after the device is assembled, the distance between the sealing cover plate (8) and the jacking column (9) is not more than 20mm, the distance between the movable base (16) and the bottom of the sealing kettle body (2) is kept to be 8-10 mm, the jacking column (9) can move downwards by means of an external device, the downward moving speed is 2mm/min, and the stroke is 30mm at most.
3. The in-situ testing device for simulating cement paste cementation strength under high-temperature high-pressure underground working conditions according to claim 1, wherein the in-situ testing device is characterized in that: the data acquisition cycle of the acquisition control system (30) is 5s.
4. The test method for simulating the cement paste cementation strength in-situ test device under the high-temperature high-pressure underground working condition as claimed in claim 1, which is characterized by comprising the following steps:
firstly, placing a lower packing (21) with a lubricant in a lower storage cavity (20) in a lower packing box (22) at the bottom of a sealed kettle body (2), then placing a lower gland (19) above the lower packing (21), sleeving a movable base (16) sleeved with a lower rubber sealing piece (24) at the bottom of the sealed kettle body (2), and carrying out auxiliary fixing on the movable base (16) through a lower nut (17), a lower gasket (18), the lower gland (19) and the lower packing (21), wherein the movable base (16) is carved with threads;
step two, a sleeve (7) with an upper rubber sealing piece (23) embedded on the inner wall is placed at the bottom of the sealed kettle body (2), the movable base (16) is kept in sleeve fit with the sleeve (7), and the outer cylinder (6) is sleeved outside the sleeve (7);
pouring the prepared cement paste into the sleeve (7), keeping the upper liquid level of the cement paste consistent with the height of an upper rubber sealing element (23) on the inner wall of the sleeve (7), and placing the sealing cover plate (8) in the sleeve (7) to ensure that the sealing cover plate (8) is just positioned at the height of the upper rubber sealing element (23);
placing an upper packing (14) with lubricant in an upper storage cavity (13) in an upper packing box (15) of a sealing kettle cover (1), placing an upper gland (12) above the upper packing (14), then sleeving a jacking column (9) into the sealing kettle cover (1), cutting threads on the jacking column (9), sleeving an upper gasket (11) above the upper gland (12), screwing an upper nut (10), pressing the upper gasket (11) against the upper gland (12), immediately pressing the upper packing (14) by the upper gland (12), and tightly holding the jacking column (9) in an extrusion state by the upper packing (14);
step five, adding simulated formation water, enabling the liquid level of the simulated formation water to be just higher than the height of a sealing cover plate (8), then placing a rubber sealing gasket (5) smeared with butter in a groove of a sealing kettle body (2), placing a sealing kettle cover (1) sleeved with a jacking column (9) above the sealing kettle body (2), fastening a fixing bolt (3) on the sealing kettle cover (1), fastening the sealing kettle cover (1) on the sealing kettle body (2), connecting the sealing kettle body (2), a heating and heat-preserving device (27), a temperature sensor (28) and an acquisition control system (30) through signal wires, connecting the jacking column (9), the pressure sensor (29) and the acquisition control system (30) through the signal wires, and enabling the acquisition control system (30) to enable the heating and heat-preserving device (27) to operate for heating, and curing cement paste for 24 hours under the preset temperature and pressure conditions;
step six, after the cement maintenance is finished, screwing a lower nut (17) to enable a movable base (16) to move downwards, screwing an upper nut (10) subsequently, assisting an external device to apply force to a jack-up column (9) to enable the jack-up column (9) to move downwards at a constant speed, keeping the speed at 2mm/min, recording the force when the jack-up column (9) starts to move on a curve generated by an acquisition control system (30), and recording as the friction force F between the jack-up column (9) and a device part f ；
Step seven, in the acquisition F f After that, the jacking column (9) continues to move at a constant speed, so that the jacking column (9) presses against the sealing cover plate (8), the sealing cover plate (8) presses against the cement stone until the acquisition control system (30) acquires the maximum force F max ；
Step eight, calculating to obtain the cementing strength M of the cement stone through a formula (1):
(1)
wherein: f (F) max The maximum force N is generated when the cement stone and the inner wall of the sleeve (7) slide relatively; f (F) f Is the friction force between the top column (9) and the device component, N; pi is 3.14; d is the inner diameter of the sleeve (7), mm; h is the height of the cement stone sample, and mm; m is the cementing strength of the cement stone and MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910865675.5A CN110470596B (en) | 2019-09-12 | 2019-09-12 | In-situ test device and method for simulating cement stone cementing strength under high-temperature high-pressure underground working condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910865675.5A CN110470596B (en) | 2019-09-12 | 2019-09-12 | In-situ test device and method for simulating cement stone cementing strength under high-temperature high-pressure underground working condition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110470596A CN110470596A (en) | 2019-11-19 |
| CN110470596B true CN110470596B (en) | 2024-03-19 |
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| CN110823712B (en) * | 2019-11-29 | 2024-05-31 | 华南理工大学 | A high temperature and high pressure curing and strength, elastic modulus comprehensive testing instrument |
| CN111300617B (en) * | 2020-02-19 | 2022-03-04 | 中海石油(中国)有限公司 | High-temperature and high-pressure cement stone curing device and cement stone preparation method |
| CN112378851B (en) * | 2021-01-17 | 2021-08-20 | 山东弘力达防腐材料有限公司 | Adhesive tape high-temperature holding power testing device |
| CN116930067B (en) * | 2023-09-19 | 2023-12-19 | 成都理工大学 | Device and method for measuring cementing strength of polluted rock face and consolidated body |
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